Someone who as started running (or cycling training) after a long period of no activity may discover that the capillaries (small vessels that carry blood) will expand. The opposite is also true. Capillaries in the legs of an inactive person may grow smaller and in some cases actually collapse because not much blood flow is necessary for what has been called a sedentary style of life.

Effects Of Exercise

As the individual exercises, the capillaries expand to let more blood flow through the legs and arms. When the nervous system surrounding these capillaries sense the change, that message is sent to the brain. This is often called an itch, but in reality it is the nerves receiving stimulus where they have not before. It's a whole new sensation. Of course, over a long period of time with regular exercise, the individual will not feel this as often or in such intensity because the capillaries remain slightly enlarged to handle the flow of blood.

Sometimes the weather conditions have an effect on the legs that is similar to itchy legs from new activity. Cold weather dries the skin and running or cycling training will stimulate blood flow. The itchy sensation may occur in this situation as well. Sweat can have a similar effect, though in both cases a moisturizing lotion should be of some help

Some runners have found that certain fabrics in running apparel cause irritation or itchiness when the body heats up. Sometimes a skin lotion in combination with athletic activity or detergent used to wash running clothes can be the catalyst for itching or discomfort. It is important that runners and cyclists wear clothes that do not irritate and also allow the skin to "breathe." Those with sensitive skin should take care not to use soap or detergent that could create a problem during running or riding.

Consult with a doctor if the condition persists and consider the possibility that food allergies may also cause the problem. Most of the time this itchy leg condition is minor and treatment of the symptoms is sufficient.

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About the Author

Interested on itchy legs while running??, Adam Peters is a consultant who writes on similar consumer topics for http://www.bikecyclingreviews.com . A website with tips on ironman triathlon and ironman triathlon training.